import math
class Computer:

    def add(a, b):
        return a+b

    def minus(a, b):
        return a-b

    def mul(a, b):
      return a*b

    def divide(a, b):
      return a/b

    def exact_dibision(a, b):
        return a//b

    def extraction(a, b):
        return math.sqrt(a)

    def power(a, b):
        return a**b
        
    def remaining(a, b):
        return a%b

print(computer.add(1,2))
print(computer.minus(1,2))